每一个恒牙与同一牙弓内的左右邻牙保持理想的邻接关系
上颌每一个恒牙应当保持与下颌牙有理想的咬合关系
坚持保存全口32个恒牙
ABC都对
ABC都不对
单选题The angle of maximum righting arm corresponds approximatelyto the angle of（）.A deck edge immersionB the load lineC downfloodingD loll
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单选题The maximum angle at which the intact stability curves are valid for ship’s is the angle for（）.A the limit of positive stabilityB the limit of small-angle stabilityC maximum offsetD downflooding
单选题For a vessel with longitudinal inclination, an increase in GML cause（）.A list to stabilize at an angle of lollB trim to stabilize at an angle of lollC trim to increaseD trim to decrease
单选题With a given load on the cargo hook，the thrust on a cargo boom（）.A increases as the angle to the horizontal increasesB increases as the angle to the horizontal decreasesC is greatest at an angle of 45° and decreases as the boom is raised or loweredD is least at an angle of 45° and increases as the boom is raised or lowered
单选题With a given load on the cargo hook，tension in a single span topping lift（）.A increases as the boom's angle to the horizontal increasesB is at a maximum when the boom is at a 45° angle to the horizontalC increases as the boom's angle to the horizontal decreasesD decreases as the boom's angle to the horizontal decreases
单选题For a vessel with list，a decrease in GMT will cause the angle of inclination to（）.A stabilize at an angle of lollB decreaseC increaseD remain constant
单选题Mariners proceeding across the main routes are recommended to do so at（）.A as wide an angle as practicableB as wide an angle so practicableC like wide an angle as practicableD like wide as angle so practicable
